Zork - The Undiscovered Underground
Light Source:
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You will find very soon after starting the game that your lantern is
ready to conk out. (You get about 30 or so moves before it goes dark.)
Unlike other Zork games, you do not need to find an alternate light
source in order to complete the game. What you must do instead is to
shake your lantern when it goes out. Apparently, this revitalizes the
batteries in the lantern for a little while. The lantern continues to
sputter and die periodically, so you will need to keep shaking it
throughout your game (good thing it's short!).